Metal bending and forging machine.



J. R. BLAKBSLBB. METAL BBNDING AND FORGING MACHINE. APPLIOATION FILED .TUNE 4, 1908.

929,073. Patented July 27, 1909.

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J. R. BLAKESLEE. METAL BBNDING AND PORGING MACHINE.

APPLICATION FILED JUNE 4, 1908.

Patented Ju1y27, 1909.

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`TOHN R. BLAKESLEE, OF CLEVELAND, OHIO, ASSIGNOR TO THE AJAX MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

METAL BENDING AND FORGING MACHINE.

Specification of Letters Patent.

Patented July 27, 1909.

To all 'whom it may concern.'

Be 1t known that I, JOHN E. BLAnnsLnn, a

citizen of the United States, resident of` Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Metal Bending and Forging Machines, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

This invention relating as indicated to metal bending and forging machines, has more particular regard tothe provision, in connection with machines of this general class, of means whereby the reciprocation of the header or up-setting die slide may be more conveniently and certainly controlled than in present types of apparatus, and that, too, Without shutting off and turning on the power.

One type of device for interrupting the o eration of the slide in a machine of the c ass in hand is shown in United States Patent No. 737,065, it being there illustrated in connection With a forging machine.

The present arrangement I have chosen to illustrate in connection with a bending machine or bull-dozer, but it scarcely need be remarked that the principle of operation involved is equally applicable to forging machines, or, indeed, any machine wherein it becomes necessary to derive a reciprocatory movement in a head, or the like, from a continuously rotating driving shaft.

Another feature of the present invention, more specific in its reference to bending or bull-(lozing machines, is the disposition of the slideway of an incline With marked advantage in the placing and securing of stock on the machine.

Said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mechanismembodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings: Figure l is a plan view of a bending machine, or bull dozer, wherein has been incorporated my several im- 'ada ted to provements; Fig. 2 is a side elevation of ythe same, aportion of the gear on the crank-shaft being broken away to more clearly reveal the parts therebehind g Fig. 3 is a central longitudinal section through the cross head or reciprocatory slide, together With appurtenant parts; and Fig. 4 is a partial plan view of such slide and one such part, viz. the latch for retaining the slide in its rear-most position.

In such figures, A will be seen to designate the bed-frame of the machine, Which usually is an integral massive casting and is securely mounted upon a solid foundation either of concrete, or of heavy timbers. Of the upper face of such bed-frame A, something less than half constitutes the die space a which is terminated or bounded at one end by the upturned foot a of the frame and at the other by the reciprocable cross head A. Cross head A is mounted on a suitable slide- Way a2 and is shown in the severaliigures in its retracted or rearmost position, its eX- treme forward or advanced position being indicated in dotted lines inFig. 2. Ordinarily, as heretofore constructed, the slide- Way 0,2 Whereon the cross-head is thus mounted together with the alined die space a, have been arranged substantially horizontally. In the present machine I have modified this arrangement by inclning such slide and die space forwardly and downwardly as clearly appears from the side elevation shown in Fig. 2. By this construction the Work or stock operated upon may be caused to lean against the upturned foot a of the machine, or the interposed die block attached c to such foot, whereby any tendency of such stock to fall from its proper'place is eliminated and it will remain in position to receive successive blows of the die slide Without special attention on the part of the operator.

Reciprocation of cross head A is effected by means of a transversely disposed crankshaft A2 mounted in suitable bearings at the rear and u per kend of, the machine, and

ge driven from a secondary shaft A3 t rough gear a3 and pinion at, as will be readily understood. rlfhe connecting means` between the crank-shaft and the cross-head, or die-slide, comprise primarily a pitman a5 having one end attached to the crank shaft, and a piston, or plunger a, normally freely reciprocable in a longitudinally extending bore a7 within the cross-head and having its rear end pivotally attached to said pitman. Such piston is rovided at its forward end with an integra head as in the form of an annulus or collar, the upper portion of which, see Fig. 3, is cut off down to a plane even with the body of the plunger proper. Plunger a is held in the bore of the cross-head by means of a split bushing a9 fitted into the rear end of such bore and firmly attached to the cross-head. The disposition of the parts and the length of the plunger is such that the head of the latter will engage this Jbushing and thereby effect retraction of the crosshead to its rearmost position upon a complete rotation of the crank shaft being had. Obviously, however, such plunger will normally be ineffective to advance such crosshead. To render plunger c thus effective to advance the cross-head, a slide am is provided, suitably mounted in a vertical slideway in the body of the cross-head that intersects the bore ai therein just in front of the plunger head when in its rearmost position. This slide am in its lowermost position will obviously lock the plunger against forward movement, thereby causing the latter, upon being advanced, to force the head with it. The position of the locking slide is controlled through a rock-shaft c mounted upon the cross head and connected with the slide by a suitable rocker arm cl2 and link (L13, such rock-shaft being in turn actuated through the medium of a second arm al" borne at its one extremity and provided with a roller (L15 adapted to contact with an inclined way b on the adjacent end of a transversely movable slide B. The latter is mounted in a suitable bracket A4 rovided on one side of the machine bed. uch inclined face of transversely movable slide B acts as a cam to engage the roller bearing arm of the rock shaft and raise the locking slide am into its inoperative position upon each retraction of the crosshead. Movement of the slide out ofthe path of the rock arm may be had either through a hand lever b or foot treadle bz both located at the forward end of the machine and connected by means of a rod b with a lever t7 on the lower end of a vertically mounted shaft 64 in the bracket A4 aforesaid, the latter in turn bearing at its upper end a lever b5 that has sliding pivotal connection with the cam slide B. A s ring 5G, conveniently attached to the treat e as shown, normally retains such cam slide in its inner, or operative, position, with the result already noted. f

Where the operative face of the machine including the slide-way and die space are inclined in the manner described there will be a tendency manifested by the slide to leave its rearmost, or retracted, position irrespective of the operation of the plunger. I accordingly find it desirable to provide a latch for securing such slide in the position in ques# tion. Such latch conveniently consists sim# ply of a spring-pressed lunger C transversely mounted in the crossead and extending a short distance beyond the side of the same into position to be engaged by a hooked lever c on the same shaft b4 whereon slide-actuating lever b5 is mounted. In the normal position of this shaft, corresponding with the inner position of the slide B, the hooked lever c will engage plunger C as the cross-head is retracted, and retain the latter in its retracted position. Vilithdrawal, however, of the slide will evidently be accompanied by a withdrawal of the latch, thus simultaneously leaving the cross-head A free to be actuated and lowering the locking slide d10 in such cross-head into position to engage the plunger a.

Since the work of the cross-head is effected during its forward stroke, I have constructed the pivotal connection between the plunger and pitman so as to relieve the pin c1 of all strain during such forward strokc by providing a bearing L17 in the plunger against which the pitman presses when it is advancing the cross-head, see Fig. 3. 'The pin will hence be seen to have only the relatively light duty of withdrawing, or retracting, the cross- 1 head upon the return movement of the pitman.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, rovided the means stated by any of the follbwing claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention l. In a machine of the class described, the combination of a shaft; a slide; means for operatively connecting said shaft and slide, said means including a pitman, a plunger reciprocably held in said slide and pivotally connected with said pitman, said plunger being adapted to engage said slide to retract the latter, a member in said slide movable in front of said plunger and adapted, when thus positioned, to render the latter effective to advance said slide, and a rock-shaft on said slide connected to move said member; and means external to said slide adapted to engage said shaft to rock the same upon reciprocation of said slide.

2. In a machine of the class described, the combination of a shaft; a slide formed with a longitudinal bore; means for operatively connecting said shaft and slide, said means including a pitman, a plunger reciprocably held in the bore of said slide and pivotally connected with said pitnian, said plunger being formed with a head adapted to engage said slide to retract the latter, a plate in said IIO slide vertically movable in front of said plunger and adapted, when lowered, to render the latter' effective to advance said slide, and a rock-shaft on said slide connected to raise said plate and provided with a rock arm; and a cam movably mounted to one side of said slide and adapted to engage such arm, and thereby raise said plate, upon retraction of said slide.

3. In a machine of the class described, the combination of a shaft; a slide formed with a longitudinal bore; means for operatively connecting said shaft and slide, said means including a pitman, a plunger reciprocably held in the bore of said slide and pivotally connected with said pitman, said plunger being formed with a head adapted to engage said slide to retract the latter, a plate in said slide vertically movable in front of said plunger and adapted, when lowered, to render the latter effective to advance said slide, and a roch-shaft on said slide connected to raise said plate and provided with a rock arm a cam movably mounted to one side of said slide and adapted normally to engage suclrarm, and thereby raise said plate, upon retraction of said slide; and means for withdrawing said cam.

4. ln a machine of the class described, the combination of a shaft; a slide; means for operatively connecting said shaft and slide, said means including a pitman, a plunger reciprocably mounted in said slide and pivotally connected with said pitman, said plunger being normally effective to retract,

but not to advance said slide; meansv adapted to engage said plunger and thereby render the same eective to advance said slide means adapted to render said plunger engaging means inoperative upon retraction of said slide and a catch supported eXternally of said slide and normally positioned to engage and secure the same in its retracted position said catch being movable from such position so as not thus to engage said slide.

5. 1n a machine of the class described, the combination of a shaft; a slide; means for operatively connecting said shaft and slide, said means including a pitman, a plunger reciprocably mounted in said slide and pivotally connected with said pitman, said plunger being normally effective to retract, but not to advance said slide g means adapted to engage said plunger and thereby render the same effective to advance said slide means adapted to render said plungerengaging means inoperative upon retraction of said slide; a spring-pressed plunger transversely mounted in said slide; and a catch movably supported externally of said slide and normally retained in position to engage said spring-pressed plunger to secure said slide in its retracted position.

6. In a machine of the class described, the combination of a shaft, a slide formed with a longitudinal bore; and means for operatively connecting said shaft and slide, said means including a pitman, a plunger reciprocably held in the bore of said slide and pivotally connected with said pitman, said plunger being formed with a head adapted to engage said slide to retract the latter, a plate in said slide vertically movable infront of said plunger and adapted, when lowered, to render the latter effective to advance said slide, and a rock-shaft on said slide connected to raise said plate and provided with a rock arm; a cam movably mounted to one side of said slide and adapted to engage such arm, and thereby raise said plate, upon retraction of said slide a catch adapted to retain said slide in such retracted position; and means for simultaneously withdrawing said cam and catch.

7. In a machine of the class described, the combination of a shaft g' a slide formed with a longitudinal bore; and means for operatively connecting said shaft and slide, said means including a pitman, a plunger reciprocably heldin the bore of said slide and pivotally connected with said pitman, said plunger being formed with a head adapted to engage said slide to retract the latter, a plate in said slide vertically movable in front of said plunger and adapted, when lowered, to render the latter effective to advance said slide, and a rock-shaft on said slide connected to raise said plate and provided with arock arm; a cam movably mounted to one side of said slide and adapted to engage such arm, and thereby raise said plate, upon retraction of said slide 5 a spring-pressed plunger transversely mounted in said slide, a catch movably supported externally of said slide and normally retained in position to engage said spring-pressed plunger to secure said slide in its retracted position; and means for simultaneously withdrawing said cam and catch.

8. In a machine of the class described, the combination of a shaft; a slide formed with a longitudinal bore; and means for operatively connecting said shaft and slide, said means 'including a pitman, a plunger reciprocably held in the bore of said slide and pivotally connected with said pitman, said plunger being formed with a head adapted to engage said slide to retract the latter, a plate in said slide vertically movable in front of said plunger and adapted, when lowered, to render the latter effective to advance said slide, and a rock-shaft on said slide connected to raise said plate and provided with a rockarm a cam movably mounted to one side of said slide and adapted to engage such arm, and thereby raise said plate, upon retraction of said slide; a substantially vertically disposed shaft adjacent to said cam and conneoted to ectuete the same; a spring-pressed shaft to simultaneously Withdraw the same plunger transversely mounted in said slide; from such operative position. 10 a Catch dborne by said Vertioay ldisposed Signed by Ine this 2nd day of' June, 1908. sha t an ada ted to engage sai p unger to Y secure said slile in its retracted position; e JOHN R' BLAKESLEE spring Connected With said shaft and nor- Attested bym mally retaining said @am and catch in oper- E. R. RODD, ative position; and Ineens for rocking said JNO. F. OBERLIN. 

